added settings page

+ added settings function
+ added language files
+ configured JS to use the input_placeholder setting
added javascript to show both parent and children of matched entries
added JS to show only matched entries

hides both the parents and children of matched
added option and language to allow user to set whether the searchbox should be focused on page load
finished script that shows only children and hides parents of matched entries
polished off show/hide parents/children javascript and settings logic
removed silly .DS_Store file
gitignored silly DSStore file
set default settings to off/hide
added changelog
updated readme